static void fill_diag()

in kernel/sthyi.c [303:394]

• 66 lines of code
• 11 McCabe index (conditional complexity)

static void fill_diag(struct sthyi_sctns *sctns)
{
	int i, r, pages;
	bool this_lpar;
	void *diag204_buf;
	void *diag224_buf = NULL;
	struct diag204_x_info_blk_hdr *ti_hdr;
	struct diag204_x_part_block *part_block;
	struct diag204_x_phys_block *phys_block;
	struct lpar_cpu_inf lpar_inf = {};

	/* Errors are handled through the validity bits in the response. */
	pages = diag204((unsigned long)DIAG204_SUBC_RSI |
			(unsigned long)DIAG204_INFO_EXT, 0, NULL);
	if (pages <= 0)
		return;

	diag204_buf = vmalloc(array_size(pages, PAGE_SIZE));
	if (!diag204_buf)
		return;

	r = diag204((unsigned long)DIAG204_SUBC_STIB7 |
		    (unsigned long)DIAG204_INFO_EXT, pages, diag204_buf);
	if (r < 0)
		goto out;

	diag224_buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
	if (!diag224_buf || diag224(diag224_buf))
		goto out;

	ti_hdr = diag204_buf;
	part_block = diag204_buf + sizeof(*ti_hdr);

	for (i = 0; i < ti_hdr->npar; i++) {
		/*
		 * For the calling lpar we also need to get the cpu
		 * caps and weights. The time information block header
		 * specifies the offset to the partition block of the
		 * caller lpar, so we know when we process its data.
		 */
		this_lpar = (void *)part_block - diag204_buf == ti_hdr->this_part;
		part_block = lpar_cpu_inf(&lpar_inf, this_lpar, diag224_buf,
					  part_block);
	}

	phys_block = (struct diag204_x_phys_block *)part_block;
	part_block = diag204_buf + ti_hdr->this_part;
	if (part_block->hdr.mtid)
		sctns->par.infpflg1 = PAR_MT_EN;

	sctns->par.infpval1 |= PAR_GRP_VLD;
	sctns->par.infplgcp = scale_cap(lpar_inf.cp.lpar_grp_cap);
	sctns->par.infplgif = scale_cap(lpar_inf.ifl.lpar_grp_cap);
	memcpy(sctns->par.infplgnm, part_block->hdr.hardware_group_name,
	       sizeof(sctns->par.infplgnm));

	sctns->par.infpscps = lpar_inf.cp.cpu_num_shd;
	sctns->par.infpdcps = lpar_inf.cp.cpu_num_ded;
	sctns->par.infpsifl = lpar_inf.ifl.cpu_num_shd;
	sctns->par.infpdifl = lpar_inf.ifl.cpu_num_ded;
	sctns->par.infpval1 |= PAR_PCNT_VLD;

	sctns->par.infpabcp = scale_cap(lpar_inf.cp.lpar_cap);
	sctns->par.infpabif = scale_cap(lpar_inf.ifl.lpar_cap);
	sctns->par.infpval1 |= PAR_ABS_VLD;

	/*
	 * Everything below needs global performance data to be
	 * meaningful.
	 */
	if (!(ti_hdr->flags & DIAG204_LPAR_PHYS_FLG)) {
		sctns->hdr.infhflg1 |= HDR_PERF_UNAV;
		goto out;
	}

	fill_diag_mac(sctns, phys_block, diag224_buf);

	if (lpar_inf.cp.lpar_weight) {
		sctns->par.infpwbcp = sctns->mac.infmscps * 0x10000 *
			lpar_inf.cp.lpar_weight / lpar_inf.cp.all_weight;
	}

	if (lpar_inf.ifl.lpar_weight) {
		sctns->par.infpwbif = sctns->mac.infmsifl * 0x10000 *
			lpar_inf.ifl.lpar_weight / lpar_inf.ifl.all_weight;
	}
	sctns->par.infpval1 |= PAR_WGHT_VLD;

out:
	free_page((unsigned long)diag224_buf);
	vfree(diag204_buf);
}